如何加密文件夹中的文件答案

【问题标题】：How to encrypt files in a folder如何加密文件夹中的文件
【发布时间】：2017-10-18 23:44:15
【问题描述】：

我正在制作一个程序来加密文件夹中的所有文件，而不是逐个加密文件。

所以，这是我的 AES 256 加密代码

public class CoreEncryption
    {
        public static byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
        {
            byte[] encryptedBytes = null;

            // Set your salt here, change it to meet your flavor:
            // The salt bytes must be at least 8 bytes.
            byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                        cs.Close();
                    }
                    encryptedBytes = ms.ToArray();
                }
            }

            return encryptedBytes;
        }
    }

    public class CoreDecryption
    {
        public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
        {
            byte[] decryptedBytes = null;

            // Set your salt here, change it to meet your flavor:
            // The salt bytes must be at least 8 bytes.
            byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
                        cs.Close();
                    }
                    decryptedBytes = ms.ToArray();
                }
            }

            return decryptedBytes;
        }
    }

这开始加密和解密文件

public class EncryptionFile
    {
        public void EncryptFile(string file, string password)
        {

            byte[] bytesToBeEncrypted = File.ReadAllBytes(file);
            byte[] passwordBytes = Encoding.UTF8.GetBytes(password);

            // Hash the password with SHA256
            passwordBytes = SHA256.Create().ComputeHash(passwordBytes);

            byte[] bytesEncrypted = CoreEncryption.AES_Encrypt(bytesToBeEncrypted, passwordBytes);

            string fileEncrypted = file;

            File.WriteAllBytes(fileEncrypted, bytesEncrypted);
        }
    }

    public class DecryptionFile
    {
        public void DecryptFile(string fileEncrypted, string password)
        {

            byte[] bytesToBeDecrypted = File.ReadAllBytes(fileEncrypted);
            byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
            passwordBytes = SHA256.Create().ComputeHash(passwordBytes);

            byte[] bytesDecrypted = CoreDecryption.AES_Decrypt(bytesToBeDecrypted, passwordBytes);

            string file = fileEncrypted;
            File.WriteAllBytes(file, bytesDecrypted);
        }
    }

所以现在，我想输入一个文件夹路径，并且我的加密过程会加密该所选文件夹中的每个文件。我该怎么做？

【问题讨论】：

为什么不能递归循环遍历所有文件？请编辑您的问题以包含您尝试过的内容。加密部分在这里有些无关紧要。话虽如此，您的加密代码还是有缺陷的。它无法加密大于 2GB 的文件，并且由于您为每次加密操作重新计算相同密码的密钥，它会非常慢。您还可以从密码中获取 IV，这是非常糟糕的做法，请改用随机 IV。

标签： c# encryption aes

【解决方案1】：

嗯.... 像这样？它在（Windows10 pro x64 / Visual Studio 2017）上运行良好。

祝你好运。

//！ -------------------------------------------------- --------------

    static void Test1()
    {

        string[] files = Directory.GetFiles(@"D:\_test", "*", SearchOption.AllDirectories);

        EncryptionFile enc = new EncryptionFile();
        //DecryptionFile dec = new DecryptionFile();

        string password = "abcd";

        for (int i=0; i<files.Length; i++)
        {
            Console.WriteLine(files[i]);
            enc.EncryptFile(files[i], password);
            //dec.DecryptFile(files[i], password);
        }
    }

【讨论】：